So sorry, Gayle. In my opinion, yes, you should not have difficulty in getting a response! I assume this is a surgeon or GYN? Call in the morning, and demand to speak to a nurse or have someone call you within the hour. Me - I'd be in my car over there waiting for them to open the door in the morning, but I'm pretty out there.
Don't worry too much right now (I know, impossible). There is plenty of time.